gh-119613: deprecate Py_IS_NAN/INFINITY and Py_IS_FINITE

Doc/whatsnew/3.14.rst

@@ -193,6 +193,10 @@ Porting to Python 3.14
 Deprecated
 ----------
 
+* Deprecate :c:macro:`!Py_IS_NAN`, :c:macro:`!Py_IS_INFINITY` and :c:macro:`!Py_IS_FINITE` macros,
+  use instead :c:macro:`!isnan`, :c:macro:`!isinf` and :c:macro:`!isfinite` available from :file:`math.h`
+  since C99.  (Contributed by Sergey B Kirpichev in :gh:`119613`.)
+
 Removed
 -------
 

Include/pymath.h

@@ -27,6 +27,10 @@
 #define Py_MATH_TAU 6.2831853071795864769252867665590057683943L
 #endif
 
+/* Py_IS_NAN, Py_IS_INFINITY and Py_IS_FINITE are deprecated
+ * since CPython 3.14.
+ */
+
 // Py_IS_NAN(X)
 // Return 1 if float or double arg is a NaN, else 0.
 #define Py_IS_NAN(X) isnan(X)

Misc/NEWS.d/next/C API/2024-05-29-09-21-37.gh-issue-119613.J2xfrC.rst

@@ -0,0 +1 @@
+Deprecate ``Py_IS_NAN``, ``Py_IS_INFINITY`` and ``Py_IS_FINITE`` macros.